Mannitol is used commonly as an osmotic diuretic to reduce intracranial pressure during the perioperative period of craniotomy. The rapid administration of mannitol solution can cause an imbalance of electrolytes such as sodium and potassium. Here, we report two cases of mannitol-induced hyperkalemia. We demonstrate that administration of mannitol during craniotomy increases potassium iron concentration, and in some cases it may cause disturbance of cardiac function.

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The efficacy of the McCoy laryngoscope, external laryngeal pressure, and their combination to improve the laryngoscopic view was evaluated in 219 patients and compared with the Macintosh laryngoscope. An experienced laryngoscopist performed laryngoscopy twice using the Macintosh laryngoscope and the McCoy laryngoscope in a random sequence, and external laryngeal pressure was applied in each laryngoscopy with the laryngoscopist's right hand. The laryngoscopic view obtained was graded on our modified Cormack's method. Without external laryngeal pressure, the McCoy laryngoscope provided a better laryngoscopic view than that obtained by the Macintosh laryngoscope (P<0.001, signed rank test), but the view was worse than that with the Macintosh laryngoscope under external laryngeal pressure (P<0.001). The McCoy laryngoscope combined with external laryngeal pressure provided a better view than the Macintosh laryngoscope with external laryngeal pressure (P<0.001).

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